26 results about "Logarithmic spiral" patented technology

This invention discloses a method for tooth profile modification and modeling of a logarithmic spiral live gear transmission, belonging to the field of mechanical transmission technology. The method includes: modifying the tooth profile of the moving tooth tip using circular arc curves or higher-order polynomial curves to obtain a modified moving tooth profile; modifying the profiles of the long axis transition section and the short axis transition section of the cam using higher-order polynomial curves to obtain a modified cam theoretical profile; obtaining the modified internal gear profile based on the motion mapping relationship between the modified moving tooth and the cam; establishing a static balance model to analyze the influence of modification parameters on contact force under working conditions; and establishing a three-dimensional model of the logarithmic spiral live gear transmission. This invention can significantly improve meshing accuracy and transmission smoothness, improve tooth profile contact stress distribution, enhance load-bearing capacity and fatigue resistance, and also provide feasible parameter guidance for actual production.

The embodiment of the invention provides a leg spiral self-adaptive binding device adaptive to a human body and a robot and wearable equipment. The binding device comprises a driving unit, a binding unit and a control unit, the spiral binding unit is in transmission connection with the driving unit, and the spiral binding unit comprises spiral binding elements which are distributed in the circumferential direction of the leg and symmetrically arranged in the length direction of the leg in a logarithmic spiral track mode; the Bowden cable group is arranged between two adjacent spiral binding elements and between the driving unit and the spiral binding elements in a penetrating manner; the pressure sensing assembly is arranged on the side, close to the leg, of the spiral binding unit; wherein the driving unit is used for driving and adjusting the winding and unwinding of the Bowden wire group according to the contact pressure between the spiral binding unit and the legs, which is detected by the pressure sensing assembly, so as to adjust the bending radian and the tightness of the spiral binding unit.

The invention discloses a multi-mode sensing gripping device and method based on a variable rigidity logarithmic spiral configuration, and is characterized in that the device comprises a driving module and a plurality of gripping blocks which are sequentially arranged along a logarithmic spiral, and the adjacent gripping blocks are hinged; wherein each grasping block comprises a skeleton main body outer layer, a variable rigidity middle layer and a buffer inner layer; wherein the skeleton main body outer layer is used for providing device support and appearance deformation; the variable rigidity middle layer is used for realizing local rigidity adjustment; a multi-modal sensor module for collecting multi-modal grasping data of the grasping block is distributed on the grasping block; and the driving module is connected with each grasping block. Through organic combination of a logarithmic spiral configuration and a variable rigidity material, and meanwhile, a flexible touch sensor array is arranged on the inner layer of the grabbing device, so that real-time detection and cooperative adjustment of rigidity, form and force control in the grabbing process are realized.

The application relates to the technical field of range hoods, and provides a volute, a centrifugal fan and a range hood. The profile of the volute comprises first, second, third and fourth profile segments connected in sequence, and the two profile segments connected in sequence are smoothly connected. The third profile segment constitutes the main body of the volute, the second profile segment constitutes the volute tongue of the volute, and the third profile segment is located on a logarithmic spiral curve. Since the logarithmic spiral curve where the third profile segment is located is an arc segment generated with the same center, the curvature of the third profile segment is continuous, and the radial gap between the logarithmic spiral curve and the reference circle is gradually increased through the design of the reference circle. Therefore, the change of the polar radius of the third profile segment is continuous, the error of the profile of the volute is reduced, the vortex in the volute can be prevented to reduce the noise of the volute, the gas in the volute can be more concentrated, and the smoke exhaust efficiency of the volute is improved.

This invention discloses a pseudo-static calculation method, system, storage medium, and electronic device for active earth pressure in finite-width fill under seismic conditions using the RB displacement mode. The method first determines the failure mode based on the fill geometry, identifying a potential slip surface composed of a combination of logarithmic spirals and straight lines. The core innovation lies in establishing a small principal stress trace arch model to quantitatively analyze the deflection of principal stresses in the soil caused by friction at the wall-soil and rock-soil interfaces, and deriving the lateral earth pressure correction coefficient. K w Based on this, the damaged soil is divided into zones, and differential equations considering the equilibrium of seismic inertial force, self-weight, and interface forces are established, combined with the aforementioned correction coefficients. K w By performing the solution, a more realistic distribution of earth pressure intensity, magnitude of resultant force, and location of application point are obtained. This invention overcomes the limitations of traditional semi-infinite soil theory and provides an accurate and reliable theoretical tool for the seismic design and stability analysis of retaining structures in narrow spaces.

The application discloses an electrocardiosignal denoising method using an improved WOA-VMD algorithm and belongs to the field of electrocardiosignal processing. The application introduces a perception disturbance mechanism into WOA by using the characteristics of VMD based on complete non-recursive decomposition, and replaces the classical logarithmic spiral curve with an equal-pitch Archimedean spiral curve to optimize the mode number and penalty parameter in VMD. Then, the ECG signal is decomposed by VMD to obtain a series of IMF components, the noise components are determined by a correlation coefficient, and the improved wavelet threshold denoising is performed on the noise components. Finally, the components are reconstructed to obtain the denoised signal. The comparison experiment of the method with the wavelet threshold algorithm and the VMD algorithm shows that the method can effectively remove various interferences in the electrocardiosignal, better retains the waveform characteristics of the ECG signal, and has potential clinical guiding significance.

An augmented logarithmic spiral antenna structure includes a first conductive layer, a dielectric layer and a second conductive layer. The first conductive layer includes a first spiral arm and a plurality of second spiral arms. The first spiral arm includes a first initial radius. The second spiral arms are disposed around and connected to the first spiral arm, and each of the second spiral arms includes a second initial radius. The dielectric layer has a top surface and a bottom surface, and the top surface is connected to the first conductive layer. The second conductive layer is connected to the bottom surface. A plurality of the second initial radii of the second spiral arms are different from each other, and different from the first initial radius.

The centrifugal pump with double helical blades and the roller granulator using the same adopt double helical blades, the first blade and the second blade affect and balance each other; the profile line of the working surface of the first blade is an Archimedes spiral line, the profile line of the back surface of the second blade is a logarithmic spiral line; the profile line of the back surface of the first blade includes a part of the first constant-pitch spiral line close to the inlet side and a part of the first variable-pitch spiral line away from the inlet side, and the profile line of the working surface of the second blade includes a part of the second variable-pitch spiral line close to the inlet side and a part of the second constant-pitch spiral line away from the inlet side, which can optimize the instability of the fluid in the helical blade pump, reduce the occurrence of vibration and noise, and the second blade in the application is equivalent to the supplement of the first blade, effectively reduces the occurrence of cavitation and cavitation, and improves the hydraulic efficiency and stability of the centrifugal pump to a certain extent.

The invention discloses a circuit breaker opening and closing coil intelligent detection method and device, relates to the technical field of circuit breaker detection, adopts a composite machine learning model to construct an intelligent detection model, can identify weaker and more complex early fault features, improves the detection accuracy and sensitivity, and improves the detection accuracy. And then training an intelligent detection model by adopting a logarithmic spiral exploration strategy, a vortex path exploration strategy based on information entropy and a fractional order balance exploration strategy based on a damping sawtooth wave oscillation factor, so that the algorithm can be effectively prevented from falling into local optimum, and when facing data of circuit breakers of different models and different working conditions, the algorithm can be accurately detected. The training of the intelligent detection model can be effectively realized, so that the intelligent detection accuracy of the opening and closing coil of the circuit breaker is ensured.

An adding system for fire-extinguishing units is disclosed for producing a mixture of extinguishing agent and extinguishing agent additive (premix) by adding an extinguishing agent additive, e.g., a foaming agent, to an extinguishing agent, e.g., water, the adding system comprising a motor, which can be driven by the extinguishing agent stream, an adding pump, which can be driven by the motor, an adding line, and an extinguishing agent additive line. The invention increases the operational reliability of an adding system for fire-extinguishing units by the outer wall of the working chamber of the motor being in the form of a rotation motor, which can also have the shape of a logarithmic spiral. Furthermore, the wall of the drainage housing of the motor, which is in the form of a rotation motor, can have a through-slot for letting the extinguishing agent in and / or out. Moreover, the inlet of the adding pump can be arranged such that the extinguishing agent additive can flow into the adding pump substantially parallel to the movement direction of the pistons of the adding pump. Finally, the adding pump can have an integrated relief valve.

The utility model discloses a kind of flexible multi-dimensional ureteroscope under grabbing device based on logarithmic spiral structure, comprising: flexible grabbing head, it can be logarithmic spiral type bending to grab stone;Flexible body part passageway, with ureteroscope operation passageway adaptive setting, flexible grabbing head is connected in the first end of flexible body part passageway;Hand control operating part, including fixed part and movable operating part, fixed part is fixedly connected in the second end of flexible body part passageway, movable operating part is movably set in the second end of flexible body part passageway, movable operating part is used to drive flexible grabbing head bending as logarithmic spiral structure.The flexible grabbing head of the utility model can be bent in multiple dimensions, realize the grabbing task of each direction self-adapting size, and can complete not in the effective grabbing range of traditional equipment, narrow space or stone in incarceration, adhesion inconvenient handling condition under grabbing task, can be used for lithotomy task in multiple scenes.

The utility model relates to the technical field of butt welding elbows, in particular to a high-pressure-resistance butt welding elbow which comprises an elbow body, a plurality of flow guide fins are arranged on the inner side of the elbow body, a stress protection sleeve is arranged on the outer side of the elbow body, and a plurality of bionic reinforcing ribs are arranged on the inner side of the stress protection sleeve. The rib height h of the bionic reinforcing ribs and the reference wall thickness t0 of the elbow body meet the condition that h is equal to (0.1-0.15) t0, the ribs of the bionic reinforcing ribs are distributed according to logarithmic spiral lines, the trend of the bionic reinforcing ribs and the tangential direction of the center line of the elbow body form an included angle of 30-45 degrees, and the wall thickness of the elbow body is distributed in a sine square manner along the tangential angle theta of the center line. The flow guide fins are matched with the bionic reinforcing ribs distributed in a logarithmic spiral mode to form a composite flow guide field, the medium flow resistance is reduced by 15%-20%, vortex generation is effectively restrained, the tangential included angle design of the ribs is 30-45 degrees, fluid shear force and the trend of the reinforcing ribs form optimal mechanical coupling, and turbulent flow energy loss is reduced.

A laser chamber includes a guide portion arranged therein such that at least a part of a first guide surface extends between first and second virtual curves over a first section of first and second virtual logarithmic spirals. The first virtual curve has a curvature decreasing along a flow direction and is a virtual curve from a first phase angle to a second phase angle of the first virtual logarithmic spiral in which an angle at which a straight line from an origin and a tangent of the first virtual curve intersect is 103°. The second virtual curve has a curvature decreasing along the flow direction and is a virtual curve from the first phase angle to the second phase angle of the second virtual logarithmic spiral in which an angle at which a straight line from the origin and a tangent of the second virtual curve intersect is 96°.

This application discloses a method and apparatus for evaluating the seismic stability of slopes with a binary stratigraphic structure, relating to the field of geotechnical engineering. A soil-rock differentiated constitutive model is established, and the spatiotemporal effects of seismic waves are simulated using simple harmonic waves. Dynamic response characteristics are calculated, and a logarithmic spiral slip surface is determined. The vertically segmented slip body is analyzed, and the inertial force resultant is obtained by integrating seismic acceleration. Using the limit equilibrium method, the slope seismic stability coefficient corresponding to the logarithmic spiral slip surface is solved. All potential slip surfaces within the slope are iteratively searched, and the slip surface corresponding to the smallest slope seismic stability coefficient is taken as the most dangerous slip surface. The displacement and acceleration dynamic response laws of the slip body under seismic loading are analyzed to form a comprehensive evaluation system. This method solves the problems of existing methods that still use a single viscoelastic constitutive model, failing to fully consider the differences in dynamic characteristics between soil and bedrock, failing to reflect the geometric boundary conditions of the slope model, and potentially overestimating seismic forces within the slope.

The invention discloses a tunnel portal upward slope anchor rod design method and device based on a generalized logarithmic spiral failure model, and the method comprises the steps: introducing a friction weight coefficient to represent the contribution weight of an internal friction angle in the strength of a rock-soil body, constructing the generalized logarithmic spiral failure model, and uniformly representing the spatial form characteristics of various rock-soil body fracture surfaces; based on the generalized logarithmic spiral damage model, a limit equilibrium analysis method is adopted, the center point of the generalized logarithmic spiral sliding surface is used as the center of moment, and tunnel upward slope safety coefficient mechanical expression is established; solving the most unfavorable sliding surface and the safety coefficient by adopting a gridding search analysis optimization method; the end wall anchor rods are included in a limit equilibrium system, the safety coefficient increment is calculated and converted into total additional resisting moment, the total additional resisting moment is distributed to all the upward slope anchor rods and the end wall anchor rods, the design bearing capacity of the single anchor rod is determined, and anchor rod parameter design is completed; according to the method, various rock-soil body fracture surface spatial form descriptions are unified, slope sliding and end wall treatment are considered as a whole, anchor rods are designed, and the integrity and reliability of reinforcing design are improved.

The utility model belongs to the technical field of thickeners, and particularly relates to a logarithmic spiral structure-based material distribution device of a high-efficiency thickener. The utility model provides the material distribution device based on the logarithmic spiral structure of the efficient thickener, which is used for enhancing the mixing and flocculation effects. The device comprises a main body channel, an ore inlet pipe is arranged at one end of the main body channel, a discharge port is formed in the bottom of the main body channel, a flocculant adding point is arranged above the main body channel, and a dilution port is formed in the side of the main body channel. The diameter of the channel body is gradually reduced along with the end away from the ore inlet pipe.

The invention belongs to the technical field of rock soil and tunnel engineering, and particularly discloses a tunnel face anchor rod design method based on a generalized logarithmic spiral failure model. According to the method, by introducing a friction weight coefficient, a generalized logarithmic helix failure model capable of continuously transitioning along with rock-soil mass cohesion and an internal friction angle is constructed; establishing a three-dimensional geometric model of a potential failure body in front of the tunnel face by combining a hemispherical collapse body, a dome rectangular bottom silo and a generalized logarithmic spiral slip body; and finally, traversing and solving the ultimate constraint force and the corresponding fracture depth of the tunnel face based on an overall moment balance equation, further providing an anchor rod reinforcement density calculation method, providing a tunnel face core soil fracture surface curve, and realizing the anchor rod length partition design with equal length of the upper half section and gradual change of the lower half section. According to the method, the defects that a traditional model is single in form, the spatial form of the loose area cannot be accurately represented, and anchor rod design depends on experience are overcome, and the theoretical property, accuracy and economical efficiency of supporting parameters are remarkably improved.

The invention relates to a pin type waterfowl with an adjustable watering area, which is provided with a plurality of ground pins capable of being inserted into the ground, and the cross section of each pin is in a polygonal star shape, so that the problem that the original single pin is easy to slip and rotate can be solved; an inner contact pin is arranged and is adjustable in a cantilever beam manner; the cross section is D-shaped and is provided with a water seepage return valve gap; an injection valve core is arranged, so that strong and weak pulsation is generated; the corner of the water channel is provided with a chamfer and is a section of a logarithmic spiral; a logarithmic spiral water baffle is arranged; a stainless steel toggle spring with an improved cross section shape; rotary flying wings are arranged; a timing device; each shoe foot is provided with at least two contact pins, and the section of each contact pin is in a hollow cone shape or is provided with a notch and a cutting edge; and a noise reduction effect is achieved, and more aerial fog is generated due to vibration, sloshing and water fetching.

The application discloses a passive earth pressure determination and retaining wall design method based on a logarithmic spiral slip surface, and comprises the following steps: determining physical and mechanical parameters of a soil body; obtaining an included angle between a slip surface and two side wall bodies based on the parameters and a logarithmic spiral slip surface; obtaining a critical earth width based on the physical and mechanical parameters and the included angle; determining a slip surface intersection with the wall body based on the critical earth width, and calculating an earth pressure by adopting a thin layer element method; and obtaining an earth pressure resultant force and a position of an action point based on the earth pressure. The application establishes a coupling relationship between a major stress and the slip surface based on a logarithmic spiral slip surface assumption, derives an included angle between the slip surface and the two side wall bodies by combining a stress Mohr circle, proposes a slip surface control equation of a limited width soil body, deduces a size and a distribution expression of a passive earth pressure by analyzing a stress of a thin layer element of a sliding soil wedge, and applies the earth pressure to an elastic foundation beam model to carry out a design of a retaining wall structure. The method has a simple solution form and good engineering application value.

An embodiment of the utility model provides a logarithmic glass fiber reinforced plastic impeller, which relates to the technical field of impellers and comprises a planting pot, blades and a base plate mounted on the upper side and the lower side of the blades, the blades are uniformly arranged on the inner side of the base plate and are in logarithmic spiral curve design, and the angles of the blades change continuously and smoothly from the center point to the outside. The intersection angle of any ray, starting from the center point of the impeller, of the blade section in the logarithmic spiral curve shape and the curve is constant, when fluid flows along the blade, energy loss can be reduced, efficiency can be improved, the fluid is more evenly distributed and flows out in an accelerated mode, and therefore the performance of a pump or a draught fan is improved. The distance from each point on the logarithmic spiral blades to the original point is increased according to the exponential law along with the angle, so that the impeller formed by the blades can provide optimized fluid dynamic conditions at different radiuses, smooth transition between the edges of the blades and other parts of the impeller is ensured, turbulence and noise are reduced, and the service life of the impeller is prolonged. And meanwhile, the durability of mechanical parts is improved.

The invention provides a laser cavity, a discharge excitation type gas laser device and a manufacturing method of an electronic device. A laser chamber of a discharge excitation type gas laser device is provided with a guide part disposed in the laser chamber so as to extend from a guide surface front end, which is an upstream end in a first direction, to at least a part of a first guide surface, which is a guide surface rear end, which is an end in the direction opposite to the first direction, on a downstream side. Between a first imaginary curve from a first phase angle to a second phase angle of the first imaginary logarithmic spiral line and a second imaginary curve from the first phase angle to the second phase angle of the second imaginary logarithmic spiral line, a first interval range corresponding to a phase angle of 90 DEG or more of the first and second imaginary logarithmic spiral lines is extended. The curvature of the first imaginary curve decreases in the flow direction, the intersection angle between the straight line passing through the origin and the tangent line of the first imaginary curve is 103 degrees, the curvature of the second imaginary curve decreases in the flow direction, and the intersection angle between the straight line passing through the origin and the tangent line of the second imaginary curve is 96 degrees.

The invention discloses a gravity-anchoring type composite retaining wall design method based on a generalized logarithmic spiral sliding surface, and belongs to the field of road engineering roadbed slope protection. According to the method, firstly, a generalized logarithmic spiral failure model introducing a friction weight coefficient is put forward and used for dynamically representing the comprehensive influence of slope cohesive force and an internal friction angle on a failure form, and continuous transition and unified description from pure cohesive soil to pure sandy soil are achieved. Based on the generalized logarithmic spiral failure model, establishing a slope gliding mass moment balance equation, and deducing the horizontal limit support force of the composite retaining wall; and an overall limit equilibrium equation considering the self weight and the anchoring force of the composite retaining wall at the same time is established, collaborative design of anti-sliding and anti-overturning stability is achieved, anchor rod design parameters are determined, and design of the overall composite retaining wall is completed.

The invention provides a laser chamber, a discharge excitation type gas laser apparatus, and a manufacturing method of an electronic device. The invention discloses a discharge excitation type gas laser device. First imaginary curve in which at least a portion of a gas guide surface from a first position on the upstream side in the flow direction of laser gas to a second position on the downstream side in the inner surface of a laser chamber defining the flow path of laser gas decreases in the flow direction and second imaginary curve in which the curvature decreases in the flow direction The second logarithmic spiral extends across a first section corresponding to a phase angle of 90 DEG or more between the first and second imaginary logarithmic spirals. The first imaginary curve is a portion from a first phase angle to a second phase angle of a first imaginary logarithmic spiral in which an angle at which a straight line from a first origin intersects with a tangent to the first imaginary curve is 103 DEG. The second imaginary curve is a portion from the first phase angle to the second phase angle of a second imaginary logarithmic spiral in which an angle at which a straight line from the first origin intersects with a tangent to the second imaginary curve is 96 DEG.

The utility model discloses a logarithmic spiral line blade shape double open blade pulverizer cutter, including spindle, cutter, sword shaft and logarithmic spiral line blade shape double open blade cutter, spindle connection drive motor, and the both sides and intermediate installation have a plurality of cutter, the cutter is installed with a plurality of sword shaft through the opening round hole, the sword shaft is arranged and installed on the cutter on the spindle interval 90 degrees and is centrally symmetric, and the adjacent two logarithmic spiral line blade shape double open blade cutters are installed on the sword shaft in the circumferential direction, and are fixed by the spacer sleeve interval. The utility model device is simple, and the efficiency is higher, can keep in the cutting process slip cut angle invariable, can effectively solve the problem that the stress is uneven, and the cutter fluctuation is big in the process of smashing, to prolong the blade use time, improve the life.

The present application relates to a kind of helical gradient lattice structure design method and medium, it is related to the lattice structure design technical field based on computer processing.The method comprises the following steps: constructing outer contour, introducing logarithmic spiral function to establish the array path of parameter curve, establishing double-lattice composite structure as the basis of lattice structure growth, gradient design is carried out on the basis of lattice composite structure, including: sequentially each point in array path is designed, lattice size parameter design and lattice structure porosity design are carried out to strut parameter;The core structure and peripheral structure of connecting interface are obtained, and the model obtained by modeling is obtained.The mechanical properties of helical gradient lattice structure are improved, the pore connectivity and distribution law are optimized, so that the layer-by-layer increasing of porosity and the continuous transition of double-layer structure interface connection are realized, the material utilization efficiency is improved while guaranteeing the stability of structure, cell migration and bone tissue growth path are effectively guided, and the bone integration ability of scaffold is optimized.